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HKIMO 2026 Grade 8 National Preliminary Set 04 Question 8

HKIMO · HKIMO 2026 Grade 8 National Preliminary Set 04

Question 8

Given $\begin{cases}3x+9y=7,\\9x-3y=-4,\end{cases}$ find $x-y$.
  1. 2
  2. -2
  3. 1
  4. -1